cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A346086 Number of permutations of [2n] such that the GCD of the cycle lengths equals 2.

Table of values

n a(n)
0 0
1 1
2 3
3 105
4 4725
5 530145
6 45270225
7 12034447425
8 2116670180625
9 737902583042625
10 219604524727012425
11 137952599116097390625
12 49583382753435146240625
13 46991310794950147391390625
14 25508895927267586991297765625
15 24661803286201363305440202410625

List of values

[0, 1, 3, 105, 4725, 530145, 45270225, 12034447425, 2116670180625, 737902583042625, 219604524727012425, 137952599116097390625, 49583382753435146240625, 46991310794950147391390625, 25508895927267586991297765625, 24661803286201363305440202410625]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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